CN205172740U - Variable lift compression ratio piston - Google Patents
Variable lift compression ratio piston Download PDFInfo
- Publication number
- CN205172740U CN205172740U CN201521001475.9U CN201521001475U CN205172740U CN 205172740 U CN205172740 U CN 205172740U CN 201521001475 U CN201521001475 U CN 201521001475U CN 205172740 U CN205172740 U CN 205172740U
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- piston body
- piston
- motor
- compression ratio
- inner sleeve
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Abstract
The utility model discloses a variable lift compression ratio piston aims at overcoming the problem that there is the mechanical structure complicacy in prior art, the part is various and the leakproofness is poor. Variable lift compression ratio piston includes piston body upper portion, endotheca, motor stator, electric motor rotor, motor cabinet, snap ring, pressure spring and piston body lower part, the motor cabinet is installed and be fixed connection in the hole on piston body lower part top, motor stator installs and be fixed connection in the tourus of the central department of motor cabinet, motor stator's bottom face and the motor cabinet contact in the tourus are connected, electric motor rotor packs into in motor stator's the centre bore, the endotheca suit is around electric motor rotor and motor stator, the dress is joined in marriage with the integral key shaft on electric motor rotor top to the splined hole of putting in and, the pressure spring is installed in the annular groove on piston body lower part top by lower with the snap ring supremely, the top in the piston body lower part is installed on piston body upper portion, adopt threaded connection between piston body upper portion and the endotheca, be sliding connection between piston body upper portion and the piston body lower part.
Description
Technical field
The utility model relates to a kind of piston of automobile engine, and or rather, the utility model relates to a kind of variable lift compression ratio piston.
Background technique
The cylinder volume when compression ratio of motor refers to that piston movement arrives lower dead center and the ratio of piston movement to volume of cylinder during top dead center, compression ratio increase effectively can improve performance and the efficiency of motor.The density of gas can be allowed to become large because pressure raises, intermolecular distance also just diminishes, and such fuel molecule and oxygen molecule distance are also just nearer, and velocity of combustion is just faster; Temperature can allow gas molecule motion speed accelerate, and fuel molecule and oxygen molecule more easily interact, and this just allows mixed gas more easily light.And less combustion space can complete burning faster, combustion process is accelerated to also improve performance.And too high compression ratio can make the frequency of sudden and violent shake increase, and the quality of high compression ratio to fuel oil puts forward higher requirement.For solving this difficult problem, in the middle of the research and development starting at present research emphasis to turn to variable compression ratio engine both at home and abroad, variable compression ratio engine passes through control device exactly, the compression ratio of real-time change motor, make motor in middle-low load situation, adopt high compression ratio to improve the thermal efficiency and the fuel economy of motor; Adopt low compression ratio to prevent the generation of pinking when high load.
Typical example is introduced:
Sa Bo SVC (variable compression ratio) motor that Geneva Auto Show is put on display, it is the motor of array 5 cylinder every cylinder 4 air valve, discharge capacity is 1598cc, but its working efficiency highly significant, its compression ratio can regulate continuously between 8:1 and 14:1, it can produce the peak output of 225 and the acrotorque of 304 Ns of rice, and power is similar to 3.2 liters of V6 motors of Honda, and oil consumption is very low---and start function to reduce by more than the fuel consume of 30% than common equal-wattage.This SVC HP, hp/litre can reach 150 often liter, and this index is the highest on current motorcar engine.Toxic emission simultaneously can reach Ou Si standard.
Adopt changeable compression ratio technique can:
1. promote the thermal efficiency of motor, improve Fuel Economy;
2. be applicable to multipropellant drive;
3. contribute to reducing discharge;
4. improve engine operational stability;
5., under the prerequisite ensureing power character, engine displacement can be made to reduce further, and structure is more compact, and specific mass is higher.
The realization of variable compression ratio of engines has a lot of technological schemes and Patents both at home and abroad at present, but mostly all there is complicated in mechanical structure, variable compression ratio numerical control difficulty, be difficult to the problems such as the volume and weight increase that solves dynamic balancing and make motor, its development difficulty and cost are increased greatly.The SVC motor of such as Sa Bo company can deflect due to integrated cylinder cap, and therefore engineer is necessary for a set of independently cooling system of its design.The cooling oil duct of this system is connected with cylinder body, and blend rubber part seals, if can the permanent working in reciprocating mode of rubber parts, just very easily ftractures because of stressed fatigue, and then causes whole cooling oil duct to occur leaking.Moreover, because this type adds hydraulic pushing device and using continuous variable compression ratio as development goal, thus its software or hardware aspect all complicated than traditional combustion engine a lot.Especially software aspect, Sa Bo at that time not yet grasps the control logic of a set of mature and reliable, to guarantee that motor can steady running when continuous variable compression ratio.Therefore until its bankruptcy, this motor is not put into actual use yet.And the technology that daily output uses adds additional a set of VCR linkage mechanism and a Control Shaft on original connecting rod.Wherein VCR linkage mechanism is made up of the connection connecting rod of rotating crank pin lever and one end and Control Shaft.When Control Shaft rotates, Control Shaft connecting rod can drive crank pin to turn round, and lever is swung.Just impel the top dead center position of piston to occur moving up and down thus, achieve the variable of compression ratio.But the system connecting rod quantity increased is a lot of, the overall frictional loss that just can cause motor thus increases, if excessive engine wearing and tearing, the obvious life-span upper just cannot accept by market; The increasing of connecting rod quantity also can make the vibration of motor become more to be difficult to control, and then causes the appearance of resonance and abnormal sound phenomenon.Therefore variable compression ratio engine made in Japan does not appear on the market yet.
Summary of the invention
Technical problem to be solved in the utility model overcomes prior art to there is the various problem with sealing difference of complicated in mechanical structure, part, provides a kind of variable lift compression ratio piston.
For solving the problems of the technologies described above, the utility model adopts following technological scheme to realize: described variable lift compression ratio piston comprises piston body top, inner sleeve, motor, motor cabinet, snap ring, stage clip and piston body bottom.
Described motor comprises motor stator and rotor.
Motor cabinet is arranged in the endoporus of piston body lower tip, corresponding frustoconic shape pit on the identical frustoconic shape boss of one to eight structure on motor cabinet bottom surface and piston body bottom is made to align equipped, motor stator is arranged in the cirque body of motor cabinet center as being fixedly connected with, the bottom end of motor stator contacts with the motor cabinet in cirque body and connects, rotor loads in the center hole of motor stator, inner sleeve is sleeved on around rotor and motor stator, and the splined shaft on the splined hole inside put and rotor top is equipped with, the inner bottom surface of inner sleeve central hole contacts with the shaft shoulder top end of rotor and connects, the bottom surface of the shaft shoulder of rotor contacts with the top end of motor stator and connects, stage clip and snap ring are arranged in the annular groove of piston body lower tip from the bottom to top, piston body top is arranged on the top of piston body bottom, piston body top with between inner sleeve for being threaded, for being slidably connected between piston body top and piston body bottom.
Motor cabinet described in technological scheme is disc-like structural member, the bottom surface of motor cabinet is distributed with equably the frustoconic shape boss that one to eight structure is identical, the frustoconic shape pit that frustoconic shape boss is identical with structure corresponding on piston body bottom aligns mutually, the center of the top end of motor cabinet is provided with the cirque body for mounted motor stator, the rotational axis conllinear of the circumference that the frustoconic shape boss that cirque body, one to eight structure are identical distributes and motor cabinet.
Inner sleeve described in technological scheme is columnar structured, the center at inner sleeve top is provided with splined hole, the physical dimension of splined hole is identical with the physical dimension of the splined shaft on rotor, outer wall of inside race is provided with the outside thread matched with the internal thread on piston body top, externally threaded shape is triangle or trapezoidal, external cylindrical surface bottom inner sleeve is provided with the cirque body formula projection that cross section is rectangle, the rotational axis conllinear of cirque body formula projection and inner sleeve.
The inner hole wall on the piston body top described in technological scheme is provided with internal thread, and the shape of internal thread is triangle or trapezoidal; Cross section bottom surface, piston body top being distributed with vertically equably two to six structures identical is fan-shaped pilot hole, piston body top is the cross section that fan-shaped pilot hole to be sleeved on piston body bottom two to six structures identical accordingly by the cross section that structure is identical is on fan-shaped guide plate, between the two for being slidably connected.
The cross section top ring surface of the piston body bottom described in technological scheme being distributed with vertically equably two to six structures identical is fan-shaped guide plate, namely the height of each guide plate is identical, width is identical, thickness is identical, the gyration center line of the circumference that guide plate distributes and the gyration center line conllinear of piston body bottom, the inner hole wall of piston body lower tip being provided with the annular groove for installing snap ring and stage clip, the bottom surface of the ring below annular groove being provided with equably the pit being used for fixing motor cabinet of the identical frustoconic shape of one to eight structure.
One end of rotor described in technological scheme is set to splined shaft, the structure of splined shaft is made up of six fan-shaped external tooths, the other end of rotor is set to optical axis, is provided with the shaft shoulder between splined shaft and optical axis, the rotational axis conllinear of splined shaft, the shaft shoulder and optical axis; The physical dimension of splined shaft is identical with the physical dimension of the splined hole at inner sleeve top center place, and the physical dimension of optical axis is identical with the physical dimension of motor stator center hole.
Compared with prior art the beneficial effects of the utility model are:
1. variable lift compression ratio piston described in the utility model changes compression ratio by installing motor mechanism in piston additional, and unfailing performance is high, easy for installation, good manufacturability.
2. variable lift compression ratio piston described in the utility model is because have employed screw mechanism engagement, makes variable compression ratio stepless, can control compression ratio accurately, meet the needs of motor under different operating mode.
3. the variable technique of variable lift compression ratio piston described in the utility model is realized by the relative position of change piston head and connecting rod, and piston top has frizing and the oil-blocking action of compression ring and oil ring, and the sealing of piston is relatively better.
4. variable lift compression ratio piston described in the utility model is changed owing to only carrying out corresponding local to internal piston, and do not relate to cylinder head and firing chamber, therefore this invention can reduce process costs greatly, and economic performance is high.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is further described:
Fig. 1 is the whole-cutaway view on variable lift compression ratio piston structure described in the utility model composition plan view;
Fig. 2 is the axonometric projection view of variable lift compression ratio piston internal structure described in the utility model;
Fig. 3 is the plan view of the inner sleeve design of part composition that variable lift compression ratio piston described in the utility model adopts;
Fig. 4 is the worm's eye view of the inner sleeve design of part composition that variable lift compression ratio piston described in the utility model adopts
Fig. 5 is the plan view of the motor rotor construction composition that variable lift compression ratio piston described in the utility model adopts;
Fig. 6 is the left view of the motor rotor construction composition that variable lift compression ratio piston described in the utility model adopts
Fig. 7-a is the plan view of the stage clip design of part composition that variable lift compression ratio piston described in the utility model adopts;
Fig. 7-b is the partial enlarged view at 1 place in Fig. 7-a;
Fig. 8 is the plan view of the stage clip design of part composition that variable lift compression ratio piston described in the utility model adopts
Fig. 9 is the plan view of the jump ring design of part composition that variable lift compression ratio piston described in the utility model adopts
In figure: 1. piston body top, 2. inner sleeve, 3. motor stator, 4. motor cabinet; 5. rotor, 6. snap ring, 7 stage clips, 8. piston body bottom, 9. guide plate.
Embodiment
Below in conjunction with accompanying drawing, the utility model is explained in detail:
Consult Fig. 1, variable lift compression ratio piston described in the utility model comprises piston body top 1, inner sleeve 2, motor (motor stator 3, rotor 5), motor cabinet 4, snap ring 6, stage clip 7 and piston body bottom 8.
Consult Fig. 1 and Fig. 2, solid piston is divided into piston body top 1 and 8 two, piston body bottom part, the cross section that (casting) have two to six structures identical that the top ring surface of piston body bottom 8 distributes vertically is equably fan-shaped guide plate 9, namely the height of each guide plate is identical, width is identical, thickness is identical, and the gyration center line of the circumference that guide plate 9 distributes and the gyration center line conllinear of piston body bottom 8, each guide plate is uniformly distributed.The inner hole wall on top, piston body bottom 8 is provided with the annular groove for installing snap ring 6 and stage clip 7, the bottom surface of the ring below annular groove is arranged equably the pit being used for fixing motor cabinet 4 of the identical frustoconic shape of (being cast with) one to eight structure, be uniformly distributed between each pit.
The inner hole wall on piston body top 1 is provided with internal thread, and the shape of internal thread is triangle or trapezoidal; The cross section that bottom surface, piston body top 1 being uniformly distributed vertically (casting) has two to six structures identical is fan-shaped pilot hole, the cross section that two to six structures are identical is the cross section that fan-shaped pilot hole is used for being sleeved on structure corresponding on piston body bottom 8 identical is on fan-shaped guide plate 9, between the two for being slidably connected.
Consult Fig. 1, Fig. 3 and Fig. 4, described inner sleeve 2 is columnar structured, the center at inner sleeve 2 top is provided with splined hole, inner sleeve 2 outer wall is provided with outside thread, the shape of screw thread is triangle or trapezoidal, outside thread on inner sleeve 2 outer wall matches with the internal thread on piston body top 1, on external cylindrical surface bottom inner sleeve 2 arrange (casting) have cross section be rectangle cirque body formula projection, the protruding down pressure by snap ring 6 of cirque body formula of the bottom of inner sleeve 2 is fixed in the circular hole on top, piston body bottom 8, the top of inner sleeve 2 loads in the endoporus on piston body top 1 for being threaded.
Consult Fig. 1, motor is p-m step motor or composite stepper motor, motor speed-regulating is controlled by forming control systems such as dual torus pulse signal, power driving circuit, single-chip microcomputers, the reducing gear carried inside is had to be used for underspeeding and improving moment of torsion, and the control of clockwise and anticlockwise can be realized, motor is divided into motor stator 3 and rotor 5, and motor stator 3 is fixed on motor cabinet 4, and rotor 5 rotates.
Consult Fig. 9, snap ring 6 is rigid structural that the circular arc do not overlapped by the inside and outside center of circle is formed, and has certain elasticity, for preventing stage clip to be shifted, plays maintenance, stable.
Consult Fig. 7 and Fig. 8, stage clip 7 is ring elastic structures, and its reed top is given prominence to, undercut.
Consult Fig. 5 and Fig. 6, top (one) end of rotor 5 is provided with (being) spline (axle), the structure of spline (axle) is made up of six fan-shaped external tooths, rotor 5 times (another) end is provided with (being) optical axis, the shaft shoulder is provided with, the rotational axis conllinear of spline (axle), the shaft shoulder and optical axis between spline (axle) and optical axis; The physical dimension of spline (axle) is identical with the physical dimension of the splined hole at inner sleeve 2 top center place, and the physical dimension of optical axis is equal with the physical dimension of motor stator 3 center hole.
Consult Fig. 1, motor cabinet 4 is disc-like structural member, on the bottom surface of motor cabinet 4, distribution (casting) has the frustoconic shape boss that one to eight structure is identical equably, the frustoconic shape boss that one to eight structure the is identical frustoconic shape pit identical with structure corresponding on piston body bottom 8 mutually equipped (aligning), the rotation in motor cabinet 4 horizontal plane is limited due to frustoconic shape pit that the structure on piston body bottom 8 is identical, the annulus bottom surface contact that bottom surface and the piston body bottom 8 of motor cabinet 4 arrange the identical frustoconic shape pit of one to eight structure is connected, limit motor cabinet 4 play downwards, the top end of motor cabinet 4 contacts with the bottom surface of inner sleeve 2 and connects, and inner sleeve 2 is subject to being arranged on the stage clip 7 on piston body bottom 8 and the restriction of snap ring 6, thus limits motor cabinet 4 upwards play, thus is fixed on piston body bottom 8 by motor cabinet 4.
Consult Fig. 1 and Fig. 2, the center of the top end of motor cabinet 4 is provided with the cirque body for mounted motor stator 3, the rotational axis conllinear of the circumference that the frustoconic shape boss that cirque body, one to eight structure are identical distributes and motor cabinet 4, motor stator 3 is arranged in cirque body as being fixedly connected with, can not planar movement, the bottom end of motor stator 3 contacts with the motor cabinet 4 in cirque body and connects, make motor stator 3 can not play downwards, rotor 5 loads in the center hole of motor stator 3, inner sleeve 2 is sleeved on rotor 5 and motor stator 3 around, and the splined shaft that the splined hole in inner sleeve 2 and rotor 5 one (top) are held is equipped with, the inner bottom surface of inner sleeve 2 center hole contacts with the shaft shoulder top end of rotor 5 and connects, the bottom surface of the shaft shoulder of rotor 5 contacts with the top end of motor stator 3 and connects, prevent rotor 5 and motor stator 3 upwards play, motor is fixed on motor cabinet 4.
Consult Fig. 1 and Fig. 2, piston body top 1 is slidably connected by the guide plate 9 one-tenth on piston body bottom 8, thus piston body top 1 is constrained in moving up and down along piston axis direction.
Consult Fig. 1, motor is connected with inner sleeve 2 by the splined shaft on rotor 5.Inner sleeve 2 is constrained on piston axis rotational freedom by stage clip 7 and snap ring 6.Stage clip 7 is subject to piston body bottom 8 to its power upwards, is subject to again snap ring 6 and produces resiliently deformable under its downward pressure, makes the elastic force of stage clip 7 have an inside restraining force to suppress inner sleeve about 2 play to inner sleeve 2.Inner sleeve 2 is connected with piston body top 1 by screw thread.
The working principle of variable lift compression ratio piston:
Consult Fig. 1, when motor needs high compression ratio, single-chip microcomputer sends positive pulse, by distribution and the amplification of driver, last Driving Stepping Motor, makes stepper motor rotate forward, and rotor 5 drives inner sleeve 2 to rotate by splined shaft, inner sleeve 2 is by the connection function of screw thread and drive piston body top 1 to move upward under the constraint of the guide plate 9 of piston body bottom 8, thus improves the compression ratio of motor.
Consult Fig. 1, when motor needs low compression ratio, single-chip microcomputer sends negative impulse, by distribution and the amplification of driver, last Driving Stepping Motor, makes stepper motor reverse, and rotor 5 drives inner sleeve 2 to rotate by splined shaft, inner sleeve 2 is by the connection function of screw thread and drive piston body top 1 to move downward under the constraint of the guide plate 9 of piston body bottom 8, thus reduces the compression ratio of motor.
Claims (6)
1. a variable lift compression ratio piston, it is characterized in that, described variable lift compression ratio piston comprises piston body top (1), inner sleeve (2), motor, motor cabinet (4), snap ring (6), stage clip (7) and piston body bottom (8);
Described motor comprises motor stator (3) and rotor (5);
Motor cabinet (4) is arranged in the endoporus on piston body bottom (8) top, the identical frustoconic shape boss of one to eight structure on motor cabinet (4) bottom surface and piston body bottom (8) upper corresponding frustoconic shape pit is made to align equipped, motor stator (3) is arranged in the cirque body of motor cabinet (4) center as being fixedly connected with, the bottom end of motor stator (3) contacts with the motor cabinet (4) in cirque body and connects, rotor (5) loads in the center hole of motor stator (3), inner sleeve (2) is sleeved on rotor (5) and motor stator (3) around, and the splined shaft on the splined hole in inner sleeve (2) and rotor (5) top is equipped with, the inner bottom surface of inner sleeve (2) central hole contacts with the shaft shoulder top end of rotor (5) and connects, the bottom surface of the shaft shoulder of rotor (5) contacts with the top end of motor stator (3) and connects, stage clip (7) and snap ring (6) are arranged in the annular groove on piston body bottom (8) top from the bottom to top, piston body top (1) is arranged on the top of piston body bottom (8), for being threaded between piston body top (1) with inner sleeve (2), for being slidably connected between piston body top (1) and piston body bottom (8).
2. according to variable lift compression ratio piston according to claim 1, it is characterized in that, described motor cabinet (4) is disc-like structural member, the bottom surface of motor cabinet (4) is distributed with equably the frustoconic shape boss that one to eight structure is identical, the frustoconic shape pit that frustoconic shape boss is identical with piston body bottom (8) upper corresponding structure aligns mutually, the center of the top end of motor cabinet (4) is provided with the cirque body for mounted motor stator (3), cirque body, the rotational axis conllinear of the circumference that the frustoconic shape boss that one to eight structure is identical distributes and motor cabinet (4).
3. according to variable lift compression ratio piston according to claim 1, it is characterized in that, described inner sleeve (2) is columnar structured, the center at inner sleeve (2) top is provided with splined hole, the physical dimension of splined hole is identical with the physical dimension of the splined shaft on rotor (5), inner sleeve (2) outer wall is provided with the outside thread that three circles match with the internal thread on piston body top (1), externally threaded shape is triangle or trapezoidal, the external cylindrical surface of inner sleeve (2) bottom is provided with the cirque body formula projection that cross section is rectangle, the rotational axis conllinear of cirque body formula projection and inner sleeve (2).
4. according to variable lift compression ratio piston according to claim 1, it is characterized in that, the inner hole wall on described piston body top (1) is provided with internal thread, and the shape of internal thread is triangle or trapezoidal; Cross section piston body top (1) bottom surface being distributed with vertically equably two to six structures identical is fan-shaped pilot hole, piston body top (1) is that to be sleeved on the identical cross section of upper two to six structures in piston body bottom (8) be accordingly on fan-shaped guide plate (9) to fan-shaped pilot hole, between the two for being slidably connected by the cross section that structure is identical.
5. according to variable lift compression ratio piston according to claim 1, it is characterized in that, the cross section top ring surface of described piston body bottom (8) being distributed with vertically equably two to six structures identical is fan-shaped guide plate (9), namely the height of each guide plate (9) is identical, width is identical, thickness is identical, the gyration center line of the circumference that guide plate (9) distributes and the gyration center line conllinear of piston body bottom (8), the inner hole wall on piston body bottom (8) top is provided with the annular groove for installing snap ring (6) and stage clip (7), the bottom surface of the ring below annular groove is provided with equably the pit being used for fixing motor cabinet (4) of the identical frustoconic shape of one to eight structure.
6. according to variable lift compression ratio piston according to claim 1, it is characterized in that, one end of described rotor (5) is set to splined shaft, the structure of splined shaft is made up of six fan-shaped external tooths, the other end of rotor (5) is set to optical axis, the shaft shoulder is provided with, the rotational axis conllinear of splined shaft, the shaft shoulder and optical axis between splined shaft and optical axis; The physical dimension of splined shaft is identical with the physical dimension of the splined hole at inner sleeve (2) top center place, and the physical dimension of optical axis is identical with the physical dimension of motor stator (3) center hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521001475.9U CN205172740U (en) | 2015-12-07 | 2015-12-07 | Variable lift compression ratio piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521001475.9U CN205172740U (en) | 2015-12-07 | 2015-12-07 | Variable lift compression ratio piston |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205172740U true CN205172740U (en) | 2016-04-20 |
Family
ID=55736742
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521001475.9U Withdrawn - After Issue CN205172740U (en) | 2015-12-07 | 2015-12-07 | Variable lift compression ratio piston |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205172740U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105370417A (en) * | 2015-12-07 | 2016-03-02 | 吉林大学 | Piston with variable lift compression ratio |
| CN106357177A (en) * | 2016-10-28 | 2017-01-25 | 吉林大学 | Stepping motor controller |
| CN112282943A (en) * | 2020-10-30 | 2021-01-29 | 吉林大学 | Effective thermal efficiency-based compression ratio control method for quality-adjusted engine |
-
2015
- 2015-12-07 CN CN201521001475.9U patent/CN205172740U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105370417A (en) * | 2015-12-07 | 2016-03-02 | 吉林大学 | Piston with variable lift compression ratio |
| CN105370417B (en) * | 2015-12-07 | 2018-02-23 | 吉林大学 | Variable lift compression ratio piston |
| CN106357177A (en) * | 2016-10-28 | 2017-01-25 | 吉林大学 | Stepping motor controller |
| CN112282943A (en) * | 2020-10-30 | 2021-01-29 | 吉林大学 | Effective thermal efficiency-based compression ratio control method for quality-adjusted engine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160420 Effective date of abandoning: 20180223 |
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| AV01 | Patent right actively abandoned |